php - 从多个表中选择内容并显示

Question

我有以下表格:问题、答案、用户答案

我正在尝试获取一个查询，在其中可以打印出问题、答案以及用户选择的答案。

到目前为止，Iv 设法打印出带有用户答案的​​问题，但没有任何顺序。

包含示例数据的表格:

**Question Table**

id    Test_ID    QText
--------------------------------------------
1       1       What colour is the sky? 


**Answer Table** 

id    Question_ID   AText
-------------------------------
1       1          Green
2       1          Blue
3       1          Red
4       1          Yellow


**User_Answers Table**

id    User_ID    Question_ID    Answer_ID
---------------------------------------------------
1      1            1             2

**Correct_Answers Table**

id    Question_ID    Answer_ID
---------------------------------------------------
1          1            1             

Expected Outcome :

Question xxxxxxx



Answer    Your Answer    Correct Answer
------------------------------------------
  1                              x 
  2          x                 
  3          
  4   

Answer 1

SELECT
    q.QText, q.id AS QId, ua.id, qa.AText,
    case when qa.ID = ua.Answer_ID then 'x' else NULL end as IsUserAnswer
FROM user_answers ua
INNER JOIN question q ON q.ID = ua.Question_ID
INNER JOIN answer qa ON qa.Question_ID = q.ID
WHERE ua.User_ID=1
ORDER BY QId, qa.ID

您错过了按 question_id 从问题到答案的连接